Furnace-grate



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F. V. MEDYNSKI.

FURNAGE GRATE.

Patented Jan. 6, 1885-.

Not 310,215.

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FEED. v. MEDYNsKI, OE IDEs MOINEs, IOWA.

FURNACE-GRATE.

SPECIFICATION forming part of Letters Patent No. 310,215, dated January 6, 1885.

Application tiled July 5, 1884. (No model.)

To all whom it may concern:

Be it known that I, FRED. V. MEDYNsKI, a citizen of the United States of America, and a resident of Des Moines, in the county of Polk and State of Iowa, have invented an Improved Furnace-Grate, of which the following is a specification.

My Object is to reduce the material weight and cost of a furnace-grate; to prevent it from being damaged by heat and fouled with adhering elinkers; to distribute air more uniformly to the fuel, and to burn the waste products of mines, known as slack, as readily as graded and screen coal or lump-coal.

My invention consists in a cellulated wide and thin grate bar or section, having a reenforcing flange on itsv under side and feet or lugs at its corners, constructed and applied as hereinafterv fully set forth.

Figure l of my accompanying drawings is a longitudinal section of my cellulated bar. Fig. 2 shows a complete bar in an inverted positiont Fig. 3 is a transverse section. Fig. 4 is a perspective view of a section of a furnace, showing my grate applied.

Jointly considered these gures clearly illustrate the construction, application, and operation of my complete invention.

A represents the at and perforated top surface of one of my grate-bars. It is preferably about six (6) inches wide regardless of the length Of the bar.

B represents a projection cast integral with each corner, that extends laterally about threesiXteenths (TSE) of an inch and downward about half an inch to maintain a slot in a complete grate between the contiguous edges ofthe bars and also to keep the ends elevated upon their supports, so that cold air can come in contact with the entire area and under side of the complete grate. The bar is preferably only about ive-eighths (t) of an inch thick and is re-enforced by a tapering iiangc, C, that is cast integral therewith, and about three-fourtl1s (i) of an inch thick at its top and about half as openings serve as air-cells and gather andretain the cold air until it becomes heated and discharged upward into the fuel upon the top of the grate to promote combustion. The heat that is usually absorbed by the metal in a gratebar is thusjutilized in heating cold air in the cells on the under side of the grate, to facilitate combustion on top of the grate, and to prevent the forming of clinkers, soot, and smoke.

I am aware that a grate has been formed of sections or bars that had webs at their sides, longitudinal grooves in their top surfaces, and tapering holes intersecting the grooves in such a manner that air could be forced through the perforations into the grooves; but the air could not circulate around the sides and ends of the section or bars, as contemplated by my improvement, in which openings are provided under the ends of each bar and at the sides of each bar in such a manner that the bars will be enveloped with air and prevented from absorbin g and retaining heat, as required to burn fuel on their fiat and smooth top surfaces without causing clinker to fuse with and adhere to the metal or to damage the bars by burning the metal.

I claim as my inventionn A furnace-grate composed of a series of bars or sections having broad, fiat, and perforated top surfaces, A, lateral and downward projections B, tapering anges C, extending along their under sides and centers, and cup-shaped openings or cells in the entire under side, substantially as shown and described, to operate in the manner set forth, for the purposes stated.

FRED. V. MEDYN SKI. Vitnesses:

THOMAS G. OEWIG, OBRA G. MOORE. 

